Sharepoint 2010 "modal dialog windows" emitted from IE can't be captured with PrtScn or Alt-PrtScn like "normal" windows. I have searched for how to do this and come up empty.

I am using Remote Desktop from Windows 7 to access machines at my office via Watchguard Mobile VPN for SSL. I am careful to make the Remote Desktop session occupy the full screen of the monitor; in turn, the IE browser is maximized to take that whole screen.

During interactions with Central Admin or really any site, there are times when SP2010 emits a dialog of some sort. I would like to capture an image of the dialog itself - i.e. none of the "darkened background" behind the dialog.